Respostas

  • Usuário do Brainly
2014-08-07T20:23:49-03:00
5.(-a+b)² - (b+3a)²
5.(a²-2ab+b²) - (b²+6ab+3a²)
5a²-10ab+5b²-b²-6ab-3a²
5a²-3a²-10ab-6ab+5b²-b²
2a²-16ab+4b².